package com.zx.crowdfunding.security;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

/**
 * 自定义的SpringSecurity权限鉴权拦截器
 * 模仿FilterSecurityInterceptor
 * 为了实现动态权限控制，不用在Controller的方法上加注解，解决了硬编码的问题
 * @author 郑雪
 * @date 2021-12-14
 */
public class CrowdFundingFilterSecurityInterceptor extends
		AbstractSecurityInterceptor implements Filter {

	private FilterInvocationSecurityMetadataSource securityMetadataSource;
	
	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation(request, response, chain);
		invoke(fi);
	}
	
	public void invoke(FilterInvocation fi) throws IOException, ServletException {
		InterceptorStatusToken token = super.beforeInvocation(fi);

		try {
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		}
		finally {
			super.finallyInvocation(token);
		}

		super.afterInvocation(token, null);
	}
	
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}

	@Override
	public void destroy() {
	}
	
	@Override
	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return this.securityMetadataSource;
	}
	
	@Override
	public Class<?> getSecureObjectClass() {
		return FilterInvocation.class;
	}
	
	public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
		return securityMetadataSource;
	}

	public void setSecurityMetadataSource(
			FilterInvocationSecurityMetadataSource securityMetadataSource) {
		this.securityMetadataSource = securityMetadataSource;
	}

}
